Depend on go 1.21, build and test with later versions

.github/workflows/test.yaml

@@ -5,16 +5,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.21.x, 1.22.x]
+        go-version: [1.22.x, 1.23.x, 1.24.x]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
     - name: Install Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Run lints
       uses: golangci/golangci-lint-action@v6
       with:

go.mod

@@ -1,3 +1,3 @@
 module github.com/yuin/goldmark
 
-go 1.19
+go 1.21

util/util_unsafe_go120.go

@@ -1,24 +0,0 @@
-//go:build !appengine && !js && !go1.21
-// +build !appengine,!js,!go1.21
-
-package util
-
-import (
-	"reflect"
-	"unsafe"
-)
-
-// BytesToReadOnlyString returns a string converted from given bytes.
-func BytesToReadOnlyString(b []byte) string {
-	return *(*string)(unsafe.Pointer(&b))
-}
-
-// StringToReadOnlyBytes returns bytes converted from given string.
-func StringToReadOnlyBytes(s string) (bs []byte) {
-	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
-	bh := (*reflect.SliceHeader)(unsafe.Pointer(&bs))
-	bh.Data = sh.Data
-	bh.Cap = sh.Len
-	bh.Len = sh.Len
-	return
-}